public override object Get(string key)
{
LogAction("Get", string.Format("Key: {0}", key));
DiskOutputCacheItem item = null;
CacheItems.TryGetValue(key, out item);
// Was the item found?
if (item == null)
{
return(null);
}
// Has the item expired?
if (item.UtcExpiry < DateTime.UtcNow)
{
// Item has expired
this.Remove(key);
return(null);
}
return(GetCacheData(item));
}
protected virtual void RemoveCacheData(DiskOutputCacheItem item)
{
var fileToRetrieve = Path.Combine(this.CacheFolder, item.FileName);
if (File.Exists(fileToRetrieve))
{
File.Delete(fileToRetrieve);
}
}
protected virtual void WriteCacheData(DiskOutputCacheItem item, object entry)
{
var fileToWrite = Path.Combine(this.CacheFolder, item.FileName);
var formatter = new BinaryFormatter();
using (var stream = new FileStream(fileToWrite, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None))
{
formatter.Serialize(stream, entry);
}
}
protected virtual object GetCacheData(DiskOutputCacheItem item)
{
var fileToRetrieve = Path.Combine(this.CacheFolder, item.FileName);
if (File.Exists(fileToRetrieve))
{
var formatter = new BinaryFormatter();
using (var stream = new FileStream(fileToRetrieve, FileMode.Open, FileAccess.Read, FileShare.Read))
{
return(formatter.Deserialize(stream));
}
}
else
{
// Eep, could not find the file!
return(null);
}
}
public override void Remove(string key)
{
LogAction("Remove", string.Format("Key: {0}", key));
DiskOutputCacheItem item = null;
this.CacheItems.TryGetValue(key, out item);
if (item != null)
{
// Attempt to delete the cached content on disk and then remove the item from CacheItems...
// If there is a problem, fail silently
try
{
RemoveCacheData(item);
CacheItems.Remove(key);
}
catch {}
}
}
public override void Set(string key, object entry, DateTime utcExpiry)
{
LogAction("Set", string.Format("Key: {0} | UtcExpiry: {1}", key, utcExpiry.ToString()));
// Create a DiskOutputCacheItem object
var item = new DiskOutputCacheItem(this.GetSafeFileName(key), utcExpiry);
WriteCacheData(item, entry);
// Add item to CacheItems, if needed, or update the existing key, if it already exists
lock (_lockObject)
{
if (this.CacheItems.ContainsKey(key))
{
this.CacheItems[key] = item;
}
else
{
this.CacheItems.Add(key, item);
}
}
}
